Ultra-hard And Metallic Constructions Comprising Improved Braze Joint - Patent 8061454

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Ultra-hard And Metallic Constructions Comprising Improved Braze Joint - Patent 8061454 Powered By Docstoc
Description: This invention generally relates to constructions comprising an ultra-hard component and a metallic component that are brazed together and, more particularly, to such a construction that is formed using a braze joint that is designed and/orformed from materials that operate to provide optimal bond strength between such components, thereby operating to improve the service life of the construction formed therefrom when compared to ultra-hard and metal constructions that are joined togetherusing conventional braze joint designs and/or materials.BACKGROUND OF THE INVENTION The use of constructions comprising ultra-hard and metallic components that are joined together is well known in the art. An example of such can be found in the form of cutting elements comprising an ultra-hard component that is joined to ametallic component. In such cutting element embodiment, the wear or cutting portion is formed from the ultra-hard component and the metallic portion of the cutting element is attached to the wear and/or cutting device. In an example embodiment, theultra-hard component can be formed from a polycrystalline material such as polycrystalline diamond (PCD), polycrystalline cubic boron nitride (PcBN), or the like, that has a degree of wear and/or abrasion resistance that is greater than that of themetallic component. In particular examples, the ultra-hard component can be formed from PCD that has been formed or treated so that it is substantially free of a catalyst material that is used to form the same and comprises bonded-together diamondcrystals. Conventionally known constructions, comprising such ultra-hard and metallic components, are typically attached to one another using a braze material. The use of a braze material to attach the two components is needed to provide a desiredattachment bond as the ultra-hard and metallic components are not themselves capable of forming an adequate bond to one another, e.g., when subjected to high-pressure/high temperature cond